Advantages and disadvatages of a hypoplastic model when used in modelling of deep excavations

In building construction, it is important to know in advance how the ground will behave in an area around an excavation. To do this we use numerical models, which predict the behavior of soils. There are many numerical models that more or less precisely predict the behavior of soils. In this thesis I will focus mainly on the hypoplastic model. It predicts the behaviour of soils well. The model has also several disadvantages, especially while predicting stress paths at small strain. I will then also describe an improved hypoplastic model, which clarifies the predictions of the soils behaviour. This thesis is created mainly as a core for a diploma thesis, which should focus on modeling of the soils behaviour, the improved hypoplastic model and excavation near the Bodam lake. This excavation was already a subjekt of a diploma thesis (Becker, 2009), but there only the original hypoplastic model was used. This thesis focuses on the description of some aspects of the mechanical soils behavior. The describtion of the original and the improved hypoplastic model and their parameters follows. In the other part of this thesis we describe the selected buiding projects of excavations in fine-grained soils